Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e852351b697e3d2…

MALICIOUS

PDF

40.1 KB Created: 2012-12-17 16:05:19 Authoring application: ameuqjcms (via shtqdthq) First seen: 2026-05-09
MD5: acd1948d50d8c6f7e5c7392eb83450be SHA-1: f5a9e009bdec707a0422526c2bfc198776c36ed2 SHA-256: 7e852351b697e3d2f197ebc296813d947556ad32fcd0c459839b984acbe86395
72 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains malformed active content streams and an embedded file, strongly indicating an exploit attempt. The ML classifier also flagged this PDF as malicious with high confidence. While no specific family is identified, the techniques suggest an exploit targeting PDF readers to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9619

Heuristics 6

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/ In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.2/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://ns.adobe.com/xfdf/In PDF document text
    • http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0016.bin pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x17E9 7076 bytes
SHA-256: a3e490b4dcf23cb3d6b7149b0221fd2e3882b332f9f1601f9ead01d00c872680
Detection
ClamAV: No threats found
Obfuscation or payload: likely
99 of 198 identifiers look randomly generated (e.g. 'DqmhhrsG0BKIAgEAx') — consistent with name-mangling obfuscation.

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